$9D/157:   Flag: $00 = Program mode: Suppress Error Messages
                  $40 = Kernal Error Messages only
                  $80 = Direct mode: Full Error Messages

Kernal-Reference:

 BIT $9D     : $F12B $F71B $F74C
 LDA $9D     : $F5AF $F68F
 STA $9D     : $FE18

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